Cheap flights from Illinois to London Heathrow Airport from $231
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to London Heathrow Airport departing on 2/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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1 adult
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0 bags
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Cheap round-trip flights
These are some of the best round-trip flight deals from Illinois to London that have been recently found on momondo from popular airlines, departing in the coming months.
Cheap one-way flights
Flying one-way? These are some of the best deals recently discovered on momondo for flights from Illinois to London.
Cheap last minute flights
Planning a quick getaway from Illinois to London? These are the last-minute flight deals available now.
Cheap direct flights
If you prefer a non-stop journey, check out our latest direct flight deals to London, so you can enjoy a seamless trip without layovers.
Cheap bus & train deals from Illinois to London
Find recent round-trip train or bus tickets from Illinois to London.
All round-trip flight deals to London
The cheapest plane tickets to London found on KAYAK recently.
Iberia flights from Illinois to London Heathrow Airport
Our best Iberia deals on Illinois to London Heathrow Airport flight tickets
Iberia![Iberia]()
Mar 17![Iberia]()
Mar 26
ORD7:30 pmChicago O'Hare Intl
7h 45m
LHR8:15 amLondon Heathrow
LHR11:55 amLondon Heathrow
8h 50m
ORD3:45 pmChicago O'Hare Intl
Iberia![Iberia]()
Apr 1![Iberia]()
Apr 10
ORD5:55 pmChicago O'Hare Intl
7h 30m
LHR7:25 amLondon Heathrow
LHR9:15 amLondon Heathrow
8h 35m
ORD11:50 amChicago O'Hare Intl
KLM flights from Illinois to London Heathrow Airport
Our best KLM deals on Illinois to London Heathrow Airport flight tickets
KLM![KLM]()
Feb 10![KLM]()
Feb 20
MDW2:08 pmChicago Midway
10h 42m
1 stop
LHR6:50 amLondon Heathrow
LHR12:20 pmLondon Heathrow
11h 51m
1 stop
MDW6:11 pmChicago Midway
KLM![KLM]()
Jan 20![KLM]()
Jan 28
MDW2:08 pmChicago Midway
10h 42m
1 stop
LHR6:50 amLondon Heathrow
LHR9:10 amLondon Heathrow
14h 37m
1 stop
MDW5:47 pmChicago Midway
See travel insights to London from
How to get the cheapest flight ticket from Illinois to London Heathrow Airport
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
Prices
Airlines
Other information
What is the cheapest month to fly to London Heathrow Airport?
The month of February is, on average, the cheapest month to fly to London Heathrow Airport from Illinois, with most prices found around $655. If you’re not able to fly to London Heathrow Airport in February, then September is your next best option. Flight prices from Illinois to London Heathrow Airport during September average around $678.
What is the cheapest day to depart on your flight to London Heathrow Airport?
Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $751. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $849.
What is the cheapest time of day to depart on your flight to London Heathrow Airport?
According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Illinois to London Heathrow Airport in the morning for as low as $776. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights at noon are often more expensive with an average ticket price of $822.
What is the cheapest Illinois to London Heathrow flight route?
Fly from Chicago O'Hare Intl to London Heathrow for the best Illinois - London Heathrow flight prices
How far in advance should I book a flight to London Heathrow Airport?
We recommend purchasing flights from Illinois to London Heathrow Airport 22 days ahead of your departure date because this is when momondo users tend to see the best flight rates. On average, our users have found flights to London Heathrow Airport for $802. Don’t hesitate to check prices now though because momondo users recently found tickets for as low as $673.
What cabin class options are available on Illinois to London Heathrow flights?
There are 4 cabin classes available to choose from on Illinois to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Illinois to London Heathrow?
JetBlue, Icelandair, and WestJet are the most popular carriers operating from Illinois to London Heathrow
What airlines fly to London Heathrow Airport?
British Airways, American Airlines and Iberia are the top three most popular airlines that fly to London Heathrow Airport from Illinois according to our data. British Airways is the first choice among our users, with 40% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 17 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from Illinois to London Heathrow Airport on average per day?
As of January 2025, there are 40 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 5:00PM, with 68% of flights taking off in the evening.
How many flights depart from Illinois to London Heathrow Airport on average per week?
280 flights are operational weekly from Illinois to London Heathrow Airport as of January 2025. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.
Cheap Illinois to London Heathrow Airport flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Illinois to London Heathrow Airport
When did momondo last update prices for flights from Illinois to London Heathrow Airport?
Prices for flights from Illinois to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Illinois to London Heathrow Airport?
As of January 2025, there are 19 operators available to choose from for flights from Illinois to London Heathrow Airport.
How old do you have to be to fly from Illinois to London Heathrow Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Illinois to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Illinois to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Illinois to London Heathrow Airport is Boeing 787-9 Dreamliner (42.64% of total bookings). The next most popular plane models are Boeing 777 (24.95%), Boeing 767-300 (14.23%), and Boeing 787-10 Dreamliner (9.51%).
Best airlines flying from Illinois to London Heathrow Airport
Compare and see reviews for airlines that fly from Illinois to London Heathrow Airport with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $381 | Free Cancellation | Rating 7.3 1,305 reviews | |||
| PriceFrom $451 | Free Cancellation | Rating 8.0 8,505 reviews | |||
| PriceFrom $471 | Free Cancellation | Rating 7.1 501 reviews | |||
| PriceFrom $507 | Free Cancellation | Rating 7.1 1,861 reviews | |||
| PriceFrom $516 | Free Cancellation | Rating 7.4 3,195 reviews | |||
| PriceFrom $554 | Free Cancellation | Rating 7.0 8,556 reviews | |||
| PriceFrom $568 | Free Cancellation | Rating 7.6 1,284 reviews | |||
| PriceFrom $570 | Free Cancellation | Rating 7.5 664 reviews | |||
| PriceFrom $577 | Free Cancellation | Rating 6.7 7,092 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.5 1,593 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Illinois to London?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to London. momondo saves you time and could save you money on your trip.
Can I find flights from Illinois to London with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Illinois to London flights to just show those with flexible booking policies.
How can momondo help me find flights from Illinois to London?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Illinois.
I’m not ready to book a flight from Illinois to London right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Illinois to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.
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